<template>
	<view class="uni-collapse-item">
		<!-- onClick(!isOpen) -->
		<view @click="onClick(!isOpen)" class="uni-collapse-item__title"
			:class="{'is-open':isOpen &&titleBorder === 'auto' ,'uni-collapse-item-border':titleBorder !== 'none'}">
			<view class="uni-collapse-item__title-wrap">
				<slot name="title">
					<view class="uni-collapse-item__title-box" :class="{'is-disabled':disabled}">
						<image v-if="thumb" :src="thumb" class="uni-collapse-item__title-img" />
						<text class="uni-collapse-item__title-text">{{ title }}</text>
					</view>
				</slot>
			</view>
			<view v-if="showArrow"
				:class="{ 'uni-collapse-item__title-arrow-active': isOpen, 'uni-collapse-item--animation': showAnimation === true }"
				class="uni-collapse-item__title-arrow">
				<uni-icons :color="disabled?'#ddd':'#bbb'" size="14" type="bottom" />
			</view>
		</view>
		<view class="uni-collapse-item__wrap" :class="{'is--transition':showAnimation}"
			:style="{height: (isOpen?height:0) +'px'}">
			<view :id="elId" ref="collapse--hook" class="uni-collapse-item__wrap-content"
				:class="{open:isheight,'uni-collapse-item--border':border&&isOpen}">
				<slot></slot>
			</view>
		</view>

	</view>
</template>

<script>
// #ifdef APP-NVUE
const dom = weex.requireModule('dom')
// #endif
/**
	 * CollapseItem 折叠面板子组件
	 * @description 折叠面板子组件
	 * @property {String} title 标题文字
	 * @property {String} thumb 标题左侧缩略图
	 * @property {String} name 唯一标志符
	 * @property {Boolean} open = [true|false] 是否展开组件
	 * @property {Boolean} titleBorder = [true|false] 是否显示标题分隔线
	 * @property {Boolean} border = [true|false] 是否显示分隔线
	 * @property {Boolean} disabled = [true|false] 是否展开面板
	 * @property {Boolean} showAnimation = [true|false] 开启动画
	 * @property {Boolean} showArrow = [true|false] 是否显示右侧箭头
	 */
export default {
  name: 'uniCollapseItem',
  props: {
    // 列表标题
    title: {
      type: String,
      default: ''
    },
    name: {
      type: [Number, String],
      default: ''
    },
    // 是否禁用
    disabled: {
      type: Boolean,
      default: false
    },
    // #ifdef APP-PLUS
    // 是否显示动画,app 端默认不开启动画，卡顿严重
    showAnimation: {
      type: Boolean,
      default: false
    },
    // #endif
    // #ifndef APP-PLUS
    // 是否显示动画
    showAnimation: {
      type: Boolean,
      default: true
    },
    // #endif
    // 是否展开
    open: {
      type: Boolean,
      default: false
    },
    // 缩略图
    thumb: {
      type: String,
      default: ''
    },
    // 标题分隔线显示类型
    titleBorder: {
      type: String,
      default: 'auto'
    },
    border: {
      type: Boolean,
      default: true
    },
    showArrow: {
      type: Boolean,
      default: true
    }
  },
  data () {
    // TODO 随机生生元素ID，解决百度小程序获取同一个元素位置信息的bug
    const elId = `Uni_${Math.ceil(Math.random() * 10e5).toString(36)}`
    return {
      isOpen: false,
      isheight: null,
      height: 0,
      elId,
      nameSync: 0
    }
  },
  watch: {
    open (val) {
      this.isOpen = val
      this.onClick(val, 'init')
    }
  },
  updated (e) {
    this.$nextTick(() => {
      this.init(true)
    })
  },
  created () {
    this.collapse = this.getCollapse()
    this.oldHeight = 0
    this.onClick(this.open, 'init')
  },
  // #ifndef VUE3
  // TODO vue2
  unmounted () {
    if (this.__isUnmounted) return
    this.uninstall()
  },
  // #endif
  // #ifdef VUE3
  // TODO vue3
  unmounted () {
    this.__isUnmounted = true
    this.uninstall()
  },
  // #endif
  mounted () {
    if (!this.collapse) return
    if (this.name !== '') {
      this.nameSync = this.name
    } else {
      this.nameSync = this.collapse.childrens.length + ''
    }
    if (this.collapse.names.indexOf(this.nameSync) === -1) {
      this.collapse.names.push(this.nameSync)
    } else {
      console.warn(`name 值 ${this.nameSync} 重复`)
    }
    if (this.collapse.childrens.indexOf(this) === -1) {
      this.collapse.childrens.push(this)
    }
    this.init()
  },
  methods: {
    init (type) {
      // #ifndef APP-NVUE
      this.getCollapseHeight(type)
      // #endif
      // #ifdef APP-NVUE
      this.getNvueHwight(type)
      // #endif
    },
    uninstall () {
      if (this.collapse) {
        this.collapse.childrens.forEach((item, index) => {
          if (item === this) {
            this.collapse.childrens.splice(index, 1)
          }
        })
        this.collapse.names.forEach((item, index) => {
          if (item === this.nameSync) {
            this.collapse.names.splice(index, 1)
          }
        })
      }
    },
    onClick (isOpen, type) {
      if (this.disabled) return
      this.isOpen = isOpen
      if (this.isOpen && this.collapse) {
        this.collapse.setAccordion(this)
      }
      if (type !== 'init') {
        this.collapse.onChange(isOpen, this)
      }
    },
    getCollapseHeight (type, index = 0) {
      const views = uni.createSelectorQuery().in(this)
      views
        .select(`#${this.elId}`)
        .fields({
          size: true
        }, data => {
          // TODO 百度中可能获取不到节点信息 ，需要循环获取
          if (index >= 10) return
          if (!data) {
            index++
            this.getCollapseHeight(false, index)
            return
          }
          // #ifdef APP-NVUE
          this.height = data.height + 1
          // #endif
          // #ifndef APP-NVUE
          this.height = data.height
          // #endif
          this.isheight = true
          if (type) return
          this.onClick(this.isOpen, 'init')
        })
        .exec()
    },
    getNvueHwight (type) {
      const result = dom.getComponentRect(this.$refs['collapse--hook'], option => {
        if (option && option.result && option.size) {
          // #ifdef APP-NVUE
          this.height = option.size.height + 1
          // #endif
          // #ifndef APP-NVUE
          this.height = option.size.height
          // #endif
          this.isheight = true
          if (type) return
          this.onClick(this.open, 'init')
        }
      })
    },
    /**
			 * 获取父元素实例
			 */
    getCollapse (name = 'uniCollapse') {
      let parent = this.$parent
      let parentName = parent.$options.name
      while (parentName !== name) {
        parent = parent.$parent
        if (!parent) return false
        parentName = parent.$options.name
      }
      return parent
    }
  }
}
</script>

<style lang="scss">
	.uni-collapse-item {
		/* #ifndef APP-NVUE */
		box-sizing: border-box;

		/* #endif */
		&__title {
			/* #ifndef APP-NVUE */
			display: flex;
			width: 100%;
			box-sizing: border-box;
			/* #endif */
			flex-direction: row;
			align-items: center;
			transition: border-bottom-color .3s;

			// transition-property: border-bottom-color;
			// transition-duration: 5s;
			&-wrap {
				width: 100%;
				flex: 1;

			}

			&-box {
				padding: 0 15px;
				/* #ifndef APP-NVUE */
				display: flex;
				width: 100%;
				box-sizing: border-box;
				/* #endif */
				flex-direction: row;
				justify-content: space-between;
				align-items: center;
				height: 48px;
				line-height: 48px;
				background-color: #fff;
				color: #303133;
				font-size: 13px;
				font-weight: 500;
				/* #ifdef H5 */
				cursor: pointer;
				outline: none;

				/* #endif */
				&.is-disabled {
					.uni-collapse-item__title-text {
						color: #999;
					}
				}

			}

			&.uni-collapse-item-border {
				border-bottom: 1px solid #ebeef5;
			}

			&.is-open {
				border-bottom-color: transparent;
			}

			&-img {
				height: 22px;
				width: 22px;
				margin-right: 10px;
			}

			&-text {
				flex: 1;
				font-size: 14px;
				/* #ifndef APP-NVUE */
				white-space: nowrap;
				color: inherit;
				/* #endif */
				/* #ifdef APP-NVUE */
				lines: 1;
				/* #endif */
				overflow: hidden;
				text-overflow: ellipsis;
			}

			&-arrow {
				/* #ifndef APP-NVUE */
				display: flex;
				box-sizing: border-box;
				/* #endif */
				align-items: center;
				justify-content: center;
				width: 20px;
				height: 20px;
				margin-right: 10px;
				transform: rotate(0deg);

				&-active {
					transform: rotate(-180deg);
				}
			}

		}

		&__wrap {
			/* #ifndef APP-NVUE */
			will-change: height;
			box-sizing: border-box;
			/* #endif */
			background-color: #fff;
			overflow: hidden;
			position: relative;
			height: 0;

			&.is--transition {
				// transition: all 0.3s;
				transition-property: height, border-bottom-width;
				transition-duration: 0.3s;
				/* #ifndef APP-NVUE */
				will-change: height;
				/* #endif */
			}

			&-content {
				position: absolute;
				font-size: 13px;
				color: #303133;
				// transition: height 0.3s;
				border-bottom-color: transparent;
				border-bottom-style: solid;
				border-bottom-width: 0;

				&.uni-collapse-item--border {
					border-bottom-width: 1px;
					border-bottom-color: red;
					border-bottom-color: #ebeef5;
				}

				&.open {
					position: relative;
				}
			}
		}

		&--animation {
			transition-property: transform;
			transition-duration: 0.3s;
			transition-timing-function: ease;
		}

	}
</style>
